With the way mine is now, we're not talking just a few millimeters off. The standoff would need to be about twice as wide as it is now to clear the bottom dome of the saucer. (It's roughly about 1/4" now, it would need to be about half an inch wide.) It's possible I somehow cut the standoff in half when I cut it out, but I of course didn't sand that much off of it.

I did a bit more research on this searching for online copies of the instructions for this kit. I found 2 different copies of the instructions, and indeed have found a difference related to the launch lug position.

Instructions for the 25th Anniv kit. This is the kit I have. The tube marking guides are on page 14.
http://www.oldrocketplans.com/estes/est1275/est1275.htm

Older kit instructions (scroll down to the 1275 number and open the .pdf). Tube marking guides are on page 15.
http://www.spacemodeling.org/jimz/estes.htm

If you look at the probe body marking guide for each, you'll notice that the launch lug is in a different position between them.

On the 25th Anniv instructions, the launch lug is positioned exactly half-way between the hold-down standoff and engine hook. This puts the launch lug at 90 degrees from both. This is how mine is.

On the older instructions, the launch lug is closer to the engine hook. This puts it at a 45 degree angle from the engine hook (135 degress from the hold-down standoff). This would make it clear the dome on my model with the width of the lug standoff as-is.

So there IS a difference, but it doesn't explain why no one else has complained about this issue with the 25th Anniversary kit.

Yes, if anyone else who has built the 25th Anniv. kit can explain the launch lug position and standoff width on theirs, I'd appreciate it.

Thanks again!